ICS9155-23N24L中文资料
Integrated Circuit
Systems, Inc.
General Description
Features
AV9155
Block Diagram
Low Cost 20-Pin Frequency Generator
The A V9155 is a low cost frequency generator designed spe-cifically for desktop and notebook PC applications. Its CPU clocks provide all necessary CPU frequencies for 286, 386 and 486 systems, including support for the latest speeds of proces-sors. The device uses a 14.318 MHz crystal to generate the CPU and all peripheral clocks for integrated desktop motherboards.
The dual 14.318 MHz clock outputs allows one output for the system and one to be the input to an ICS graphics frequency generator such as the AV9194.
The CPU clock offers the unique feature of smooth, glitch-free transitions from one frequency to the next, making this ideal device to use whenever slowing the CPU speed. The A V9155makes a gradual transition between frequencies, so that it obeys the Intel cycle-to-cycle timing specification for 486systems. The simultaneous 2X and 1X CPU clocks offer controlled skew to within 1.5ns (max) of each other.ICS offers several versions of the A V9155. The different devices are shown below:
Compatible with 286, 386, and 486 CPUs Supports turbo modes
Generates communications clock, keyboard clock,floppy disk clock, system reference clock, bus clock and CPU clock
Output enable tristates outputs Up to 100 MHz at 5V or 3.3V 20-pin DIP or SOIC
All loop filter components internal
Skew-controlled 2X and 1X CPU clocks
Power-down option
ICS has been shipping motherboard frequency generators since A pril 1990, and is the leader in the area of multiple output clocks on a single chip. The A V9155 is a third generation device, and uses ICS s patented analog CMOS phase-locked loop technology for low phase jitter. ICS offers a broad family of frequency generators for motherboards, graphics and other applications, including cost-effective versions with only one or two output clocks. Consult ICS for all of your clock generation needs.
Pentium is a trademark of Intel Corporation.
PART DESCRIPTION
A V9155C-01Motherboard clock generator with 16 MHz BUS CLK A V9155C-02Motherboard clock generator with 32 MHz BUS CLK A V9155C-23Includes Pentium ? frequencies A V9155C-36Features a special 40 MHz SCSI clock
AV9155
AV9155 Functionality- AV9155-01
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU *5V only.PERIPHERAL CLOCKS REFERENCE CLOCKS
Functionality - AV9155-02
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU PERIPHERAL CLOCKS
REFERENCE CLOCKS
Frequency Transitions
A key feature of the A V9155 is its ability to provide smooth, glitch-free frequency transitions on the CPU and 2XCPU clocks when the frequency select pins are changed. These frequency transitions do not violate the Intel 486 specification of less than 0.1% frequency change per clock https://www.360docs.net/doc/2614049959.html,ing an Input Clock as Reference The A V9155 is designed to accept a 14.318 MHz crystal as the input reference. With some external changes, it is possible to use a crystal oscillator or clock input. Please see application note AN04 for details on driving the A V9155 with a clock.
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
FDCLK
(Pin 7)
KBCLK
(Pin 8)
1.843*16*24*12*
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
FDCLK
(Pin 7)
KBCLK
(Pin 8)
1.843*32*24*12*
REFCLK1
(Pin 13)
REFCLK2
(Pin 14)
14.31814.318
REFCLK1
(Pin 13)
REFCLK2
(Pin 14)
14.31814.318
FS2 (Pin 11)
FS1
(Pin 19)
FS0
(Pin 20)
2XCPU
(Pin 17)
CPU
(Pin 18)
0 0 0 0 1 1 1 10
1
1
1
1
1
1
1
1
8
16
32
40
50
66.66
80*
100*
4
8
16
20
25
33.33
40*
50*
FS2 (Pin 11)
FS1
(Pin 19)
FS0
(Pin 20)
2XCPU
(Pin 17)
CPU
(Pin 18)
0 0 0 0 1 1 1 10
1
1
1
1
1
1
1
1
8
16
32
40
50
66.66
80*
100*
4
8
16
20
25
33.33
40*
50*
*5V only.
AV9155
AV9155
CLOCK#2 CPU and 2XCPU
*5V only
PERIPHERAL CLOCKS
REFERENCE CLOCKS
CLOCK#2 CPU and 2XCPU
PERIPHERAL CLOCKS
REFERENCE CLOCKS
COMMCLK (Pin 1)
BUSCLK (Pin 6)FDCLK (Pin 7)KBCLK (Pin 8)1.843
16*
24
12
SCSICLK (Pin 1)BUSCLK (Pin 6)FDCLK (Pin 7)KBCLK (Pin 8)40*
15*
24*
12*
REFCLK1(Pin 13)REFCLK2(Pin 14)14.318
14.318
REFCLK1(Pin 13)REFCLK2(Pin 14)14.318
14.318
FS2(Pin 11)FS1 (Pin 19)
FS0(Pin 20)2XCPU (Pin 17)CPU (Pin 18)00001111
00110011
01010101
81660405066.6680*100*
4830202533.3340*50*
Functionality - AV9155-23
(Using 14.318 MHz input. All frequencies in MHz.)Functionality - AV9155-36
(Using 14.318 MHz input. All frequencies in MHz.)FS2(Pin 11)FS1(Pin 19)FS0(Pin 20)2XCPU (Pin 17)CPU (Pin 18)00001111
00110011
01010101
75*3260405066.6680*52
37.5*1630202533.3340*26
*5V only
AV9155
AV9155
AV9155-01 and AV9155-02CLOCK#2 CPU and 2XCPU
PERIPHERAL CLOCKS
Actual Output Frequencies
(Using 14.318 MHz input. All frequencies in MHz.)AV9155-23CPU CLOCK
PERIPHERAL CLOCKS
AV9155-36CPU CLOCK
PERIPHERAL CLOCKS
FS2 (Pin 11)
FS1 (Pin 19)
FS0(Pin 20)2XCPU (Pin 17)CPU (Pin 18)00001111
00110011
01010101
7.5015.5132.2240.0950.1166.8280.18*100.23*
3.757.7616.1120.0525.0633.4140.09*50.11*
FS2(Pin 11)FS1(Pin 19)FS0(Pin 20)2XCPU (Pin 17)CPU (Pin 18)00001111
00110011
01010101
8.05416.00259.87539.88650.11366.47680.181*100.226*
4.0278.00129.93619.9432
5.05733.23840.091*50.113*
COMMCLK (Pin 1)BUSCLK (Pin 7)FDCLK (Pin 6)KBCLK (Pin 8)40.00
15.00
24.00
12.00
FS2 (Pin 11)
FS1 (Pin 19)
FS0 (Pin 20)
2XCPU (Pin 17)CPU (Pin 18)00001111
00110011
01010101
75.170*31.94060.13640.09050.11366.47680.181*51.903*
37.585*15.97030.06820.04525.05733.23840.091*25.952*
COMMCLK (Pin 1)BUSCLK (Pin
6)FDCLK (Pin 7)KBCLK (Pin 8)1.846
32.01 or 16.00
24.00
12.00
COMMCLK (Pin 1)BUSCLK (Pin 6)FDCLK (Pin 7)KBCLK (Pin 8)1.846
16.00
24.00
12.00
*5V only.*5V only.
AV9155
AV9155
AV9155
AV9155